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| author | Chris Lattner <sabre@nondot.org> | 2007-04-12 05:58:43 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2007-04-12 05:58:43 +0000 |
| commit | 4829b1c6ab810ee274a104985915988b4f92aa7a (patch) | |
| tree | 0ca8ea62f615854c46290b8b198d8582830fce31 /lib/CodeGen/SelectionDAG/SelectionDAG.cpp | |
| parent | 1780d861ac8251c78f71df8af4ed39d97cf919bb (diff) | |
fold noop vbitconvert instructions
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35943 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAG.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index a51f79f592..7c8a94eaf5 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -1484,6 +1484,15 @@ SDOperand SelectionDAG::getNode(unsigned Opcode, MVT::ValueType VT, MVT::getVectorNumElements(VT) == N3.getNumOperands() && "Illegal VECTOR_SHUFFLE node!"); break; + case ISD::VBIT_CONVERT: + // Fold vbit_convert nodes from a type to themselves. + if (N1.getValueType() == MVT::Vector) { + assert(isa<ConstantSDNode>(*(N1.Val->op_end()-2)) && + isa<VTSDNode>(*(N1.Val->op_end()-1)) && "Malformed vector input!"); + if (*(N1.Val->op_end()-2) == N2 && *(N1.Val->op_end()-1) == N3) + return N1; + } + break; } // Memoize node if it doesn't produce a flag. |